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The amount of lime applied is related to soil type, pH, crop type and purpose of application. Generally, 40 to 80 kg of quicklime or slaked lime is used per mu. The application of lime in soils with strong acidity such as red soil in dry land is better, and should be applied more, with less or no application of slightly acidic and neutral soils. For sandy soils, the amount of lime should be appropriately reduced, generally 50kg per acre.
Can be used as base fertilizer and top dressing, but not suitable for seed fertilizer. As a base fertilizer, lime and farmyard manure can be applied together during the preparation of the land, and it can also be combined with green manure. 50-70kg per acre of vegetable land, if used for soil improvement, 150 ~ 250kg per acre. When planting soy-sweet vegetables such as soybeans and roots on calcium-deficient soil, use 15 to 25 kg of lime per acre or apply. Cruciferous vegetables such as radish and Chinese cabbage are mixed with lime and organic fertilizer when transplanting seedlings, which can effectively prevent clubroot disease. For top dressing, if lime is not applied as a base fertilizer during the preparation of the ground, lime can be applied during the growth of the vegetables. Apply strips or acupoints, apply 15kg per acre.
Note that lime should not be used excessively. Lime is strongly alkaline and should be applied evenly. Avoid contact with seeds or roots when applying ditch and acupoints. The application of lime must be combined with the application of organic fertilizers and nitrogen, phosphorus and potassium fertilizers, but the lime and human animal excrement and ammonium nitrogen fertilizers should not be stored or applied in combination, and should not be stored and applied in combination with superphosphate. Lime has a residual effect of 2 to 3 years. When the amount of application is large, the application amount in the second year and the third year can be gradually reduced, and then the application is stopped for two years.
Huaxian Agricultural Technology Center Li Dongxia
Calcium fertilizer suitable for vegetables and application method
1 limestone contains 95% to 98% calcium carbonate. Limestone is ground through a 1.5 mm screen to form a limestone powder. Large amounts of application do not cause excessive soil alkalinity. 2 Gypsum contains more than 80% calcium sulfate. The agricultural gypsum is made of gypsum ore crushed through a 0.25 mm aperture sieve and is white or gray powder. In addition to providing calcium nutrition to crops, sulfur is also available. 3 Calcium nitrate contains 19% water-soluble calcium, 15.5% nitrogen, it is easy to absorb moisture, and it should be sealed during storage. The aqueous solution is acidic. 4 lime includes quicklime and slaked lime, which are commonly used calcium fertilizers in production. Quicklime, limestone is calcined to form quicklime, also known as calcined lime, containing 90% to 96% of calcium oxide, strong alkaline, highly hygroscopic, white powder or blocky, and has a strong ability to neutralize soil acidity. Excessive application of quicklime will lead to a decrease in the effectiveness of nutrients such as iron, manganese, zinc, copper and boron in the cultivated soil, and even induce nutrient deficiencies, which is not conducive to the growth of vegetables. After slaked lime and quicklime absorb water, it transforms mature lime. When it absorbs water, it releases a lot of heat. It is also called slaked lime. It contains about 70% calcium oxide. It is strongly alkaline and has the ability to neutralize soil acidity weaker than quicklime. The application of lime helps to reduce disease, increase yield, improve quality, increase soil pH and improve soil structure. In acidic soils, lime can eliminate the toxicity of aluminum. It can increase the adsorption amount of calcium on the surface of soil colloid, so that the stability of soil structure, aeration and water permeability are improved, and the crop grows normally. Promote the activities of soil beneficial microorganisms, accelerate the decomposition of organic matter and nutrient release, increase the content of available nitrogen, phosphorus and potassium in soil, reduce the fixation of phosphorus in iron and aluminum ions in soil, and improve the availability of phosphorus in soil. Lime is a strong alkaline substance that kills germs and eggs in the soil and eliminates weeds.
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